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0. M. CAREY.

(No Model.)

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UNITED STATES PATENT OFFICE.

ORRIN M. CAREY, OF HEGEWISOH, ILLINOIS, ASSIGNOR TO THE UNITED I STATES ROLLING STGGK COMPANY.

ARCH-BAR JIG.

SPECIFICATION forming part of Letters Patent No. 362,201, dated May 3, 1887.

Application filed January 24, 1887. Serial No. 225,344. (No model.) i

To all whom, it may concern.-

Be it known that I, ORRIN M. CAREY, of Hegewisch, in the county of Cook and State of Illinois, have invented a certain new and useful Arch-Bar Jig, of which the following is a specification.

The object of my invention is to provide a support for centering and holding car-truck arch-bars while undergoing the drilling process, which shall be adjustable to the various shapes and sizes occurring in practice; and my invention. consists in the combination of parts hereinafter described and claimed.

In the drawings, Figure l is aplan, and Fig. 2a side, view of my improved jig. Fig. 3 is a cross-section through a; 00, Fig. 2, and Fig. 4. is a cross-section through y 11 Fig. 2.

A, Figs. 2 and 4, is the base, secured in any suitable manner to the table of a drill-press. At its center is bolted the vertically-adj ustable support B. Resting upon it is the arch-bar support 0. The support Cis hinged at b b b b and divided and slotted at c c c c, and the several sections are clamped together by the several bolts, e. The central bolts, 9 g, Fig. 4, serve to secure the two supports 13 and O to gether.

From one side of G rises a series of lugs, severally marked d. Passing through these are set-screws a a. On the opposite side of the support 0 are two eccentric cams, ff. By

means of the set-screws and cams, bars of any Width may be held and instantly detached.

The mode of operation is obvious. The height and shape of the jig is made, by the adjustments before described, to conform to those of the arch-bar. It is then secured to the drillpress in the proper position relative to the gang of drills, and is ready for use.

The location of the holes in the arch bar is determined wholly by the relation of the'jig to the drills, as no laying out is done nor templet used; and for this reason it is important that thesupport for the arch-bar should 

